Add Briefcase packaging docs and scripts

packaging/build-linux.sh

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+#!/bin/bash
+set -e
+briefcase create linux --no-input
+briefcase build linux --no-input
+briefcase package linux --no-input

packaging/build-macos.sh

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+#!/bin/bash
+set -e
+briefcase create macos --no-input
+briefcase build macos --no-input
+briefcase package macos --no-input

packaging/build-windows.ps1

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+briefcase create windows --no-input
+briefcase build windows --no-input
+briefcase package windows --no-input

packaging/flatpak/seedpass.yml

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+app-id: io.seedpass.SeedPass
+runtime: org.gnome.Platform
+runtime-version: '46'
+sdk: org.gnome.Sdk
+command: seedpass-gui
+modules:
+  - name: seedpass
+    buildsystem: simple
+    build-commands:
+      - mkdir -p /app/bin
+      - cp -r ../../build/seedpass-gui/ubuntu/noble/* /app/bin/
+    sources:
+      - type: dir
+        path: ../../
+finish-args:
+  - --share=network
+  - --socket=fallback-x11
+  - --socket=wayland

packaging/snapcraft.yaml

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+name: seedpass
+base: core22
+version: '0.1.0'
+summary: Deterministic password manager
+description: |
+  SeedPass deterministically generates passwords using BIP-39 seeds.
+grade: devel
+confinement: strict
+apps:
+  seedpass-gui:
+    command: bin/seedpass-gui
+    plugs:
+      - network
+      - x11
+parts:
+  seedpass:
+    plugin: dump
+    source: build/seedpass-gui/ubuntu/noble/app
+    stage-packages:
+      - libgtk-3-0
+      - libglib2.0-0
+      - libgdk-pixbuf2.0-0